Sunan an-Nasa'i, Hadith 4232 ⓘ
It was narrated that Nubaishah Al-Hudhaili said: "A man said: 'O Messenger of Allah, we used to sacrifice the 'Atirah during the Jahiliyyah in Rajab; what do you command us to do?' He said: 'Sacrifice to Allah, the Mighty and Sublime, whatever month it is, do good for the sake of Allah, the Mighty and Sublime, and feed (the poor)."'
أَخْبَرَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، عَنِ ابْنِ عُلَيَّةَ، عَنْ خَالِدٍ، قَالَ حَدَّثَنِي أَبُو قِلاَبَةَ، عَنْ أَبِي الْمَلِيحِ، فَلَقِيتُ أَبَا الْمَلِيحِ فَسَأَلْتُهُ فَحَدَّثَنِي عَنْ نُبَيْشَةَ الْهُذَلِيِّ، قَالَ قَالَ رَجُلٌ يَا رَسُولَ اللَّهِ إِنَّا كُنَّا نَعْتِرُ عَتِيرَةً فِي الْجَاهِلِيَّةِ فَمَا تَأْمُرُنَا قَالَ " اذْبَحُوا لِلَّهِ عَزَّ وَجَلَّ فِي أَىِّ شَهْرٍ مَا كَانَ وَبَرُّوا اللَّهَ عَزَّ وَجَلَّ وَأَطْعِمُوا " .
also referenced under: Book 41, Hadith 11 (In-Book) & Volume 5, Book 41, Hadith 4237 (DarusSalam)